New crown virus afraid of cold or hot? Does the sun kill the virus? Tongji experts solve doubts

Netease Science and Technology News January 28 news Low-temperature freeze-dead virus, sauna heat-dead virus, temperature-warming virus are gradually disappearing. Various opinions about viruses and temperature are quite different, but they are widely spread. How resistant is the new coronavirus to temperature? After staying at home for so long, can I take a turn downstairs in the rare good weather, and the sun comes out to clear, is it suitable for outdoor activities? Ma Ke, deputy chief physician of the Department of Infectious Diseases of Tongji Hospital, will answer your questions.

1. Current research evidence shows that the new coronavirus is more afraid of heat or cold?

Coronavirus is more sensitive to heat. The virus is moderately stable in a suitable maintenance solution at 4 ° C and can be stored for several years at -60 ° C. However, as the temperature increases, the virus’s resistance decreases, but it must reach a certain temperature and exceed the corresponding It takes time to inactivate the virus.

2. Does the ambient temperature affect the infectivity of the virus? Is there a difference in transmission in different regions (such as Northeast and Hainan)? Will the infectivity of the virus decrease as the temperature rises?

It can survive in different body fluids and even the surface of the object at room temperature for 2-10 days. Temperature mainly affects the survival time of the virus and does not affect its infectious capacity.

Because SARS coronaviruses can be transmitted through respiratory aerosols, inactivating the virus in various ways and adopting multi-faceted protective measures can minimize the possibility of infection.

3. How much and how long does the high temperature have a killing effect on the virus? High-temperature environment disinfection? Does turning on air conditioning and heating work?

The virus is sensitive to heat and can effectively inactivate the virus when it reaches a temperature of 56 ° C for 30 minutes. However, it is impossible to achieve the effect of inactivating the virus by raising the ambient temperature by heating with an air conditioner.

4. In addition to fear of heat, what is the virus afraid of? (Disinfectant, ethanol, chlorine-containing disinfectant, etc., correct use)

In addition to exterminating the virus at high temperatures, lipid solvents such as ether, 75% ethanol, chlorine-containing disinfectants, peracetic acid, and chloroform can effectively inactivate the virus.

Air disinfection method:

1. Some people open the window twice a day for 30 minutes each time.

2. When there is an ultraviolet lamp, irradiate the ultraviolet lamp once a day in an unmanned room for more than 1 hour each time.

3. Disinfection method for the surface and ground of environmental objects: use 1000mg / L chlorine-containing disinfectant or peroxyacetic acid and hydrogen peroxide paper towels to wipe and disinfect thoroughly, twice a day.

Experts remind: First, the sun’s irradiation temperature cannot reach 56 degrees, and the intensity of ultraviolet rays in sunlight can not reach the intensity of ultraviolet lamps. Second, it needs a duration of 56 degrees and 30 minutes, and the ultraviolet lamp is irradiated for 60 minutes. The conditions must be met at the same time, which is difficult to achieve in the ordinary outside environment.

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